The c.212T>G variant in GP9 is a missense variant predicted to cause substitution of Phenylalanine by Cysteine at amino acid 71 (p.Phe71Cys). At least one patient (Patient BS-23 in PMID:21699652) with this variant had aggregation absent for ristocetin and present for all other agonists, as well as less than 10% expression of GPIba measured by flow cytometry, which is highly specific for Bernard-Soulier syndrome. Additionally, the patient had excessive mucocutaneous bleeding which is consistent with Bernard-Soulier syndrome (PP4). This variant has been detected in at least three unrelated probands with Bernard-Soulier syndrome. Two of these individuals were homozygous for the variant (PMID:21699652, 1 PM3 point). One individual was compound heterozygous for this variant and the NM_000174.5(GP9):c.182A>G (p.Asn61Ser) which has been classified as Pathogenic by the PD VCEP. (1 PM3 point). These variants were confirmed in trans by family testing (2 PM3 points, PM3_Strong). The Grpmax filtering allele frequency in gnomaDv4.1 is 0 (based on 1/1179890 alleles) in the European (non-Finnish) population, which is below the <0.0000329 threshold for PM2_supporting. In summary, this variant meets the criteria to be classified as Likely Pathogenic for autosomal recessive Bernard-Soulier syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen PD VCEP: PP4, PM3, PM2_Supporting, PM3_Strong (VCEP specifications version 1).